Kavach, the indigenously-developed train collision avoidance system, is set for countrywide implementation by taking up 4,000-5,000 km each year following the commissioning of up to 2,000 km this year in the South Central Railway zone, said Railways Minister Ashwini Vaishnaw on Friday. This is a perfect example of Prime Minister Narendra Modi’s Atmanirbar Bharat,” he told mediapersons at a railway …